wifi: rtw89: disable RTS when broadcast/multicast

RTS switch should not be enabled for broadcast and multicast. This
could cause incorrect behavior during AP mode, so we fix it.

Signed-off-by: Po-Hao Huang <phhuang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/20240119081501.25223-5-pkshih@realtek.com